If one of the pilots had noticed the hands of "" ... My old Sensitive Altimeter ..." spinning round ( say.. by FL33.0 ?), one of them might have noticed that the THS had reached an unusual reading of fully NU.
If I remember correctly, in the Airbus the trim wheel does not make the 'clack-clack-clack' sound that other aircraft do. Another example of technology that seems to be designed to withhold information from the pilots? As in the sidestick configuration?